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Results of Criteria Pollutant Assessment Pollutant tons per year Predicted Highest Ratio of additional emitted Additional incrennentalambient (8760 hrs) Incremental concentration to Ambient Minnesota Ambient Concentration Air Quality ug/m3 Standard Particulate matter 0.00034 1.42e-3 2.84e-5 10 microns Nitrogen oxides 0.86 6.21 0.006 Sulfur Dioxide 0.37 0.69 8.67E-03 Carbon Monoxide 0.01 51.1 1.46E-02 SCREEN3 modeling predicts the maximum ambient air concentration from a crematory to be 19 meters ftom the stack. These concentrations are compared to Minnesota ambient air quality standards in the table above by calculating the ratio of the maximum predicted concentration and the ambient air quality standard. As shown above, all additions are less than 1 percent of the ambient air quality standard. Results of Toxic Pollutant Assessment The same SCREEN3 modeling results were used to eyaluate the resulting ambient air concentrations oftoxics released. Both short term effects ("acute") and long term effects ("chronic" or "cancer") were reviewed. The results are in Attachment 4. To evaluate whether the ambient concentration of a toxic pollutant is of concern, the MPCA compares the amount of a toxic in the air against its health benc~ark. The benchmarks used by the MPCA have been established by MDH, EP A, anq other states. To do this comparison, a ratio of the ambient concentration of each pollutant to its acceptable health threshold is determined. The MPCA considers no further review necessary of inhalation effects if this "hazard quotient" is less than one. Additionally, to account for pollutants have synergistic effects or affecting a person in the same way (e.g., all eye irritants), the hazard quotients are summed. The "hazard index" (the sum of the hazard quotients) should be below 1 as well. The results of this assessment show that for the pollutants assessed, no pollutant exceeds a hazard quotient of 1, nor does the hazard indices for each exposure scenario exceed 1. Assessment of Mercury Deposition The concentration of pollutants at a distance of2000 meters was modeled in order to assess the concentration of mercury in the atmosphere over McCarron Lake. 3